The Texas Instruments SN74LS158D is a 74LS-series TTL multiplexer that selects one of two 4-bit data sources onto a single 4-bit output bus. The 4 x 2:1 configuration means four independent 2-input multiplexer channels share a common select line and a common output-enable (strobe) — a standard building block for data routing in 5 V logic systems. The 16-SOIC surface-mount package suits automated assembly on mixed-technology boards where through-hole 74LS parts are being phased out. Its 4.75 V to 5.25 V single-supply range and 400 µA / 8 mA output drive (high/low) are typical for the 74LS family, providing enough fan-out for up to ten standard LS loads per output.
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